oSIST prEN 3196:2026
(Main)Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
General Information
- Abstract
This document specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated, for aerospace applications.
Classification: 1 100 MPa1/425 °C2.
- Status
- Not Published
- Public Enquiry End Date
- 09-Jul-2026
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 21-May-2026
- Due Date
- 08-Oct-2026
- Completion Date
- 10-Jul-2026
Overview
oSIST prEN 3196:2026 is a draft European Standard developed by SIST to specify the characteristics of self-locking, hexagonal nuts made from heat-resisting steel FE-PA92HT (A286) and silver plated, designed for aerospace applications. The standard classifies these aerospace nuts for use at a strength of 1 100 MPa at ambient temperature and up to 425 °C. This document supersedes EN 3196:1994, introducing updates in materials specification, technical definitions, and editorial improvements, ensuring alignment with current aerospace fastener requirements.
Key industries utilizing these nuts include commercial aviation, defense, and spacecraft, where reliability and high-temperature performance are critical. The standard ensures that nuts used in these environments meet stringent quality, strength, and operational requirements.
Key Topics
- Material Specifications
- Nuts are manufactured from FE-PA92HT (A286), a heat-resisting steel renowned for its durability in extreme conditions.
- Material options are referenced according to EN 2399, EN 3638, EN 3639, TR 3791, and SAE AMS5525 standards.
- Surface Treatment
- Silver plating is required in accordance with EN 2786 to enhance corrosion resistance and lubricity.
- Specific minimum thickness is mandated for different thread sizes to ensure consistent performance.
- Design and Classification
- The standard specifies configuration, dimensions, tolerances, and mass according to ISO 7995 and ISO 5855-2 where applicable.
- Nuts are self-locking and hexagonal, supporting secure fastening even under vibration.
- Marking and Identification
- Marking must comply with EN 2424, ensuring traceability and consistent identification in aerospace supply chains.
- Quality and Compliance
- Manufacturers require approval under EN 9100 or equivalent aerospace quality management standards.
- Product qualification must follow EN 9133 or an established aerospace procedure, with documentation of compliance.
Applications
Self-locking hexagonal nuts covered by oSIST prEN 3196:2026 are specifically intended for aerospace applications where reliability in high-temperature and high-stress environments is paramount. Typical applications include:
- Aircraft Engines and Structures
- Fastening components exposed to high temperatures and mechanical loads.
- Spacecraft and Satellites
- Assemblies requiring secure locking despite thermal cycling and vibration.
- Defense and Military Hardware
- Applications demanding fail-safe fasteners under rigorous operating conditions.
- Aerospace Manufacturing and Maintenance
- Use in design, assembly, and maintenance of aerospace vehicles where standardization of fasteners is essential.
By specifying detailed requirements for materials, surface treatments, and testing, this standard supports safety, interchangeability, and performance reliability throughout the aerospace industry.
Related Standards
This standard is part of a wider series of documents ensuring quality and interoperability in aerospace fasteners and materials. Relevant documents and standards include:
- EN 2399 - Aerospace series - Heat-resisting steel FE-PA2601 for bolts.
- EN 2424 - Marking of aerospace products.
- EN 2786 - Electrolytic silver plating of fasteners.
- EN 3152 - Technical specification for nuts, self-locking, MJ threads, in heat-resisting steel.
- ISO 5855-2 - Aerospace MJ threads, limit dimensions for bolts and nuts.
- ISO 7995 - Dimensions for self-locking hexagonal nuts with MJ threads.
- EN 9100 - Quality management systems for aviation, space, and defense.
- EN 9133 - Qualification procedure for aerospace standard products.
- SAE AMS5525 - Steel, corrosion and heat-resistant specification.
By aligning with these standards, oSIST prEN 3196:2026 helps manufacturers, suppliers, and operators ensure that aerospace fasteners meet international expectations for quality, safety, and durability.
Relations
- Effective Date
- 20-Jan-2026
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Frequently Asked Questions
oSIST prEN 3196:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated - Classification : 1 100 MPa (at ambient temperature) / 425 °C". This standard covers: This document specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated, for aerospace applications. Classification: 1 100 MPa1/425 °C2.
This document specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated, for aerospace applications. Classification: 1 100 MPa1/425 °C2.
oSIST prEN 3196:2026 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels; 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
oSIST prEN 3196:2026 has the following relationships with other standards: It is inter standard links to SIST EN 3196:2001. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
oSIST prEN 3196:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2026
Aeronavtika - Matice, šestrobe, samozapiralne, iz toplotnoodpornega jekla FE-
PA92HT (A286), posrebrene - Klasifikacija: 1100 MPa (pri temperaturi okolice)/425
°C
Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT
(A286), silver plated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
Luft‑ und Raumfahrt - Sechskantmutter, selbstsichernd, aus hochwarmfesten Stahl
FE‑PA92HT (A286), versilbert - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C
Ta slovenski standard je istoveten z: prEN 3196
ICS:
49.025.10 Jekla Steels
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2026
ICS 49.030.30 Will supersede EN 3196:1994
English Version
Aerospace series - Nuts, hexagonal, self-locking, in heat
resisting steel FE-PA92HT (A286), silver plated -
Classification : 1 100 MPa (at ambient temperature) / 425
°C
Luft- und Raumfahrt ¿ Sechskantmutter,
selbstsichernd, aus hochwarmfesten Stahl FE-PA92HT
(A286), versilbert ¿ Klasse: 1 100 MPa (bei
Raumtemperatur)/425 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3196:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4-s
2 Normative references . 4
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration – Dimensions – Tolerances – Mass . 5
4.2 Materials . 5
4.3 Surface treatment . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
7.1 General. 8
7.2 Approval of manufacturers . 8
7.3 Qualification of products . 8
Bibliography . 9
European foreword
This document (prEN 3196:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3196:1994.
EN 3196:1994:
— Clause 3, “Terms and definitions”, added;
— 4.2, “Materials”, standards TR 3791 and SAE AMS5525 added;
— Clause 7, “Technical specification”, editorially revised.
1 Scope
This document specifies the characteristics of self-locking hexag
...